6.6L V8 VIN D Auto 11

An intermittent open between a module and a star connector may cause this DTC to set.

A poor connection at a module or a star connector may cause this DTC to set.

An intermittent open in a star connector may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1300

Class 2 Data Link Low

Possible Causes:

These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .

An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .

Trouble Code: U1301

Class 2 Data Link High

Possible Causes:

These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .

An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .

Trouble Code: U1305

Class 2 Data Link Low or High

Possible Causes:

These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .

An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .

Trouble Code: U1500

Inter-Device Dedicated Bus Malfunction

Possible Causes:

The diagnostic procedure used for DTC U1500 in OnStar® systems with single module generations of OnStar® differ greatly from previous generations with 2 modules. While these older generations denoted a failure of the 3-wire bus between the modules by setting a U1500, single module OnStar® systems use this DTC to denote an internal module failure. The determination of whether a one or 2-module generation of OnStar® is used should be confirmed. Refer to OnStar Description and Operation .

This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the VCIM.

If this DTC is retrieved as both a current and history DTC, replace the VCIM.

Trouble Code: U1881

Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Energy Storage Control Module (ESCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1882

Energy Storage Control Module (ESCM) Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1885

Energy Storage Control Module (ESCM) Lost Communication With Hybrid Control Module (HCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1886

Energy Storage Control Module (ESCM) Lost Communication With Powertrain Control Module (PCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1887

Energy Storage Control Module (ESCM) Lost Communication With Starter/Generator Control Module (SGCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1888

Hybrid Control Module (HCM) Lost Communication With Energy Storage Control Module (ESCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1889

Hybrid Control Module (HCM) Lost Communication With Body Control Module (BCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1890

Hybrid Control Module (HCM) Lost Communication With HVAC Control Module

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1892

Hybrid Control Module (HCM) Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1893

Hybrid Control Module (HCM) Lost Communication With Powertrain Control Module (PCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1894

Hybrid Control Module (HCM) Lost Communication With Starter/Generator Control Module (SGCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1895

Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Powertrain Control Module (PCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1896

Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Starter/Generator Control Module (SGCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1897

Starter/Generator Control Module (SGCM) Lost Communication With Energy Storage Control Module (ESCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1898

Starter/Generator Control Module (SGCM) Lost Communication With Hybrid Control Module (HCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.

An internal module malfunction may cause this DTC to set.

Trouble Code: U1899

Starter/Generator Control Module (SGCM) Lost Communication With Powertrain Control Module (PCM)

Possible Causes:

Important:

For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.

DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.

An intermittent open between a module and a star connector may cause this DTC to set.

An intermittent open on high speed GMLAN may cause this DTC to set.

An open voltage or ground circuit to a module may cause this DTC to set.